Nonskid wheel



M. HAAGEN NONSKID WHEEL oct. 2s, 1930.

Filed Aug. 21, 1929 l Il div ` Patented l Oct.'y 28,; 1930 UNITED STATESMAX HAAGEN, oF BERLINv-CHARLOTTENBURG, GERMANY NoNsKIn WHEEL Applicationled August 21, 1929,` Serial No. 387,493, and inkGermany October 24,'1928.

invention relates to non-skid wheels Y for automobiles and morevparticularly has Vreference to means foroperating radially skidding.Sand, however, frequently is not at hand when required and, besides, isa very 10 unsatisfactory non-skid means.

It khas been proposed, therefore, to provide other, more efficaciousnon-skid means. Spring-influenced spikes or claws khave been proposedwhich are radially shiftably aroutward by means of an operating membershiftable on the wheel axle and manipulated from the drivers seat., Whenin operative position, spikes of this type or their operat ing Amembers`often break in two under the action' of the weight of the car whenhitting a solid obstacle in driving.

. Another proposal provides spikes whichv arey shifted into operativeposition by means of a curved member and held in this posin tion byratchetteeth mounted on the spikes and Vcorrespondingpawls mounted onthe rim of the wheel. This device also suffers from the disadvantage ofthe ratchet teeth or the pawls breaking under the action of theV weightof thecar when hitting an obstacle.

The present invention has for its obj ect the solution of thisproblem,which object is ob tained by having the inner ends of the spikesdesigned so as to form'` hooks adapted to be vengaged by pawls pivotedon the wheel body and to be disengaged by means of a disk which isshifted through the intermediary of f a lever system; AWhen released inthis manner by these pawls, the spikes automatically move outward underspring action and when hitting an obstacle or merelytheroad itself,"

recede in a radial direction so as to give way Vto the obstacle.vWhenthe lever system and the diskare released, each spike when reced-ving is preventedfrom projectingagain by itsv pawl until thedisk isoperated anew kby the lever system. Y

In order that my invention maybe more 'the arrangement in connectionwith a ranged on the driving wheels and areshifted i easily understood,a preferred embodiment of my improved nonfskid arrangement is illus'-trated by way of example in the drawing in which A l Figure l is adiametrical sectionthrough 4 Y wheelf shown in dotted lines, while y j lIfigure 2 is a detail showing a slight modification. K i y y Referringto ligure l, a is the wheel which has mounted on its frontside,lby'screw bolts b, a circular diskL vc l,on which radially orslightly tangentially yguided bar-shaped spikes Z are shiftablyarranged. These spikes d vare guided in the rim c1 andin an inner ringc2 fixed on disk c and are each under the vraction of aspring f, thestrength of which is determined yaccording to the load carried by thewheel. The inner endsof the spikes l each form a hook e. v 4Each Vhook ehas a pawl lever i cooperatingtherewith, which levers f aremountedfo'n'diskc toward its center in m which sleeve can bevreciprocated alongA extension Z from the drivers seat vby means of alever system o, as shown.

On a normal road where no non-skid means are required, all'spikes Z arein their inner position and are held therein by the hooks z'l of thelever z' vengaging their hooks e. When skidding is to be prevented,lever ojis simply thrown over in the direction of arrow whereby sleeve nwith disk m is shifted to the left and vall levers i are swungk againstthe action of their springs h and release the spikesd which areprojected `in unison out-k ward under the action of their springs f intooperative position. In this position their'r outer endsproject beyondthe tread sur. face y of the tire. In the same measure as the spikes dtouch or penetrate into, the ground, they exert a non-skid action uponthe wheels. When arriving about in a. vertical position relatively tothe road,

spikes shift inward and then outward again during the revolution of thewheel as long as disk m is held in operative position. When disk m isshifted back to the position of rest, as illustrated, the spikes dsuccessively are shifted inward until their hooks e again engage thehooks i1 of the levers al1 spikes thus being shifted to inoperativeposition during one revolution of the wheel. In this position theyscarcely touch the road even with a slack tire.

Owing to the rubber tires wearing out in y the course of time, thespikes d will eventually move inward farther than required for thecorrect mutual engagement of thehooks e and i1. To secure a reliableretention of the spikesin this case also, a series of hooks or ratchetteeth, e, e is advantageously provided ion each spike instead of asingle hook, as illustrated in Figure 2, the hook l of each lever ihaving a corresponding shape. The spikes then are Correctly engaged bythe appurtenant hook 1, no matter how far the spikes are shifted inwardon disk 0. What I claim and desire to secure by Let ters Patentis:

A non-skid wheel comprising radially shiftable spikes', springs adaptedto shift them into operative position, at least one ratchet tooth oneach of said spikes, pawls pivotally mounted on the Wheel body and eachadapted to engage the tooth of one of said spikes, an actuating membercommon to all said pawls, and a lever system adapted to actuate saidmember. The foregoing specification signed at Ber- V 1in this 7th day ofAugust, 1929.

MAX HAAGEN.

